This paper discusses electrical fatigue response for ferroelectric ceramics under electrical cyclic load. The change of remanent polarization (P-r) is chosen to show the damage evolution of electrical characters of ferroelectric ceramics PZT-5. Raw relations between P-r and number of cyclic electric load are obtained from raw loops experimentally under three applied electrical field: 431sin(100 pit), 647sin(100 pit) and 862sin(100 pit) KV/m. Exact relations between P-r and number of cyclic electric load are derived from corrected loops by applying a filter algorithm on the raw loops. The following results are obtained from experiments and error elimination analysis: P-r of ferroelectric ceramics PZT-5 decreases with the number of cycles of the applied electrical cyclic field. The higher the applied electrical field, the faster the reduction of P-r. The higher applied electrical cyclic field causes heavier damage evolution in ferroelectric material.